U-Bahn, S-Bahn & Tram in Hamburg: Städtischer Schienennahverkehr in der Hansestadt - Urban Rail in the Hanseatic City: Robert, Schwandl: 9783936573640: Amazon.com: Books
File:U-Bahn-Plan München.png - Wikimedia Commons
Munich railroad stations translated to English : r/europe
München (Munich) U-Bahn, Bavaria, Germany - Railway Technology